Valve-gear for explosive-engines.



A. A. KARCHER. VALVE GEAR FORBXPLOSIVE ENGINES.

APPLICATION FLED MAE. 5j, 190,9.

' Patented Got. 26

A. A. KARCHER. VALVE GEAR POB. EXPLOSIVBBNGINBS.

APPLICATION FILED MAE. 5, 1909.

938,386. Patented ogn. 26, 1909. 2 SHEETS-SHEET 2.

Z9 l 3635* 3,6 Qg .9 A 3/ 5 a 27 a 24 231 Cit y ing drawings.

`pattern, which rotates 111 suitable bearings UNITED sTATEs PATENToEEIoE.

938,386, Specification of Letters Patent. Patented Oct, 26, 1909Application led March 5, 1909. Serial No. 481,494.

To all whom it may concern: f tate in suitable beariiigs 14 and 15supported Beit known that I, ARTHUR A. KARCHER, by the housing 16, whichhousing also acts citizen ofthe United States, residing at Deas a guideand support; for the four vvalve troit, in the countyof .'Wayne andState of litters 17d, 17C, 17" and 17, which corre- `chigan, haveinvented certain new 'and spend tothe cylinders, the valves of whichuseful 'Im rovements in Valve-Gear for Exthey actuate, and therespectivecams. To plosive-Engines, of which the following isa gtheupper end of the litters are attached one specitication. i end ofeach of the four valve rods and the is invention relates to valve gearsfor other end is connected to the correspondin internal combustionengines. Its object is to one of the four respective rock ar'ms 191,19,

produce a valve mechanism free from the long f 19 and 19a. Rockarm 19dis securely tttcam shaft and its objectionable'teatur'es and tached torock shaft 20 one end of. which 1s complications, and one quiet inoperation supported by bearing 21 which in turn is and commerciallycheap, to build. I attain supported by housing 22 which is bolted tothese objects by the mechanism hereinafter cylinder A. The other endof-rock shaft 20 described and illustrated in the accompa-ny- I issupported by bearing 23 which is attached The gear is shown adapted to afour cylin- 20 is attached a double rock arm 24, one end der four cycleengine, but it is to be underof which actuates the exhaust valve, thestood that it is not contined to this precise other end of whichactuates the intake valve. number of cylinders, for this mechanism Rockarm 19c is attached to rock shaft 25 may be used on any number ofcylinders. one end of which is supported by bearing' 26 In the drawings,Figure l is an end view with a partial-sectional view of a cylinder andthe crank case. lFig. 2 is a' side elevation, partly in section. Fig. 3is a top view, partly insection. Fig. et 1s a detail in section of thecam shaft, with the cycle in diagram. w

Referring specifically to the drawings, 1 is the crank ce e to which isattached cylinders A, B, C and D.

2 is a four throw crank shaft of the usual arm 28, one end of whichactuates the exso as to allow rock snaft 20 to pass freely through itscenter.

shaft 29 one end of which is supported by bearing 30 which -in turn isalso supported 1n crank case 1, to which shaft the pistons t by housing22. The other end of rock shaft are connected by rods 3. 29is supportedby bearing 31 which is athe inlet and exhaust valves are mounted tachedto cylinder B. To rock shaft 29 is atin the head of each cylinder, and adescripf tached the double rock arm 32 one end of tion of one willanswer for all. which actuates exhaust valve, and the other 5 iS theeXhauSt Valve Which S lcated in end the intake valve. This shaft is alsotu- I bular, so as to allow rock shafts 25 and 20 to extend freelythrough its center.

ook arm. 19a on one end of rock shaft 33, is supported by the bearing 34in the housing 22 and by bearing 35 which is attached to cylinder A, andthls rock shaft has the double rock arm 36 to actuate the exhaust andintake valves. This rockshaft 33 is also tubular so as to allowrockshaft 29 to pass vGear llis attached and rotates with crank freelythrough its center. In short, the shaft 2 and meshes with gear l2 whichhas various shafts are telescoped. twice as many teeth as gear ll andconse- There are .two springs on each exhaust quent-ly rotates on: yone-half as fast, or one valve,-spring 8 and spring 37.v Thefuncrevolution for two of the crank shaft. The tions of exhaust spring 8have already been to hold valve 5 to its seat. One end of this springrests on nut 7 the other end against lence the description of one willsuffice for both.

. gear 12 is fast on the short cam shaft 13 explained. Spring 37actsindependently of which has four cams d, c, b and a, which roexhaustspring 8, inasmuch as one end rests haust valve .and the other endactuates the; lintake-valve. The rock shaft 25 is tubularA Rock arm 19bis fixed to one end of rockof the cam marked valve the other end bearsagainst the end of the double rock arm. This spring is much heaviervthan the'intake springs 38. and consequently' holds each of' the fourvalve lifters 17, 17 17b and 17, in close apposition with the fourrespective cams. As the cams rotate when that depressed portion Chargingstroke arrives at the valve litters it allows the litters to be forceddown by the spring 37 .which being of suiii'cient strength compressesthe sprin 38 and opens the intake valves.

The four cycles of operation of cylinder A.' (forexample) are 'asfollows: Referring to Fig. 1, the motor is .hewn to rotate the crankshaft to the right, as indicated bJIy arrow on gear 11, cam shaftrotating to le t as indicated by arrow on gear 12, and the engine isjust starting on working stroke. The strokes are indicateddiagrammatically on Fig. 4. The crank shaft will make one cycle orone-half revolution on working or combustion stroke, bringing .theraised part ofcam around to valve litter... On the return cycle,orone-half revolution the raised part on nut 7 and i of the cam will passthe valve lifter causing.

therebylifting rock arm 'of double rock arm 36 When this the same torise, 19", forcing down end exhaust valve.

at its highest point or center, an that portion of the camat thebeginning of the charginf stroke l-is in apposition with the liter. Onthe downward or charging stroke or cycle, 'that portion of the cam,indicated as the Char will pass ging stroke the valve lifter, allowingspring 37 to force valvelifter down into fiat portion of cam l which clethe position will cause the double rock arm 36 to force intake valveopen, allowing pistonl to draw in its charge. At the completion of thisstroke or cycle the piston is at its lowest ointor center and thatportion ot' the cam at the beginning of the compression stroke is inapposition with the valve lifter, both valves being closed. On thereturn compression stroke or cycle that portion of the cam markedCompression stroke passes the valve lifter, but as that portion is atrue cirof the valve lifter is not changed, land consequently bothvalves remain closed allowing the charge to be compressed. At thecompletion otfthis stroke or cycle the piston is at its highest point orcenv connected to each `"ple, and convenient for repair, adjustment andmanipulation.

I claim 4:

. 1. 'rheeo'mbinaoa with a plurality .of

parallel cylinders having normally closed 1nlet and exhaustvalvestelescoped rock sha extending transversely heads and each having armsprojecting oppositely andbearing on the stems of the respective valvesof each same when the shaft is rocked, a spring operconnected to eachshaft to rock ythe same in one direction, and a cam operatively shaftand acting in oppoto rock the :tts of dilierent 'lengths sition to thespring other direction.

' 2. The combination of a plurality of parallel cylinders -each havingadjacent normally closed inlet and exhaust valves, a set of telescopedrock shaftsv extending across the cylinders and between the valve stems,each shaft having oppositely extending arms bearing on said stems toopen either valve when the shaft is rocked one way or the other, aspring operatively connected to one 'of the said arms and tendin to rockits shaft one wa a cam shaft having a cam for each rockshaft, and afollower for-each cam, connected to one of thel rock shafts, the camshaving elevations acting to rockthe shafts against the pressure of saids rings and thereby open one valve of the cy inders and; l: the

depressions allowing the springs to roc shafts the other way and therebyopen other valves.'

In testimon in presence o located beside each. -otherv in the head ofeach cylinder, a set o cylinder, to open the across the cylinder shaftin the the

